59 lines
1.8 KiB
Python
59 lines
1.8 KiB
Python
##
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# This software was developed and / or modified by Raytheon Company,
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# pursuant to Contract DG133W-05-CQ-1067 with the US Government.
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#
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# U.S. EXPORT CONTROLLED TECHNICAL DATA
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# This software product contains export-restricted data whose
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# export/transfer/disclosure is restricted by U.S. law. Dissemination
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# to non-U.S. persons whether in the United States or abroad requires
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# an export license or other authorization.
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#
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# Contractor Name: Raytheon Company
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# Contractor Address: 6825 Pine Street, Suite 340
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# Mail Stop B8
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# Omaha, NE 68106
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# 402.291.0100
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#
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# See the AWIPS II Master Rights File ("Master Rights File.pdf") for
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# further licensing information.
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###
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## @file AdiabaticTemp.py
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from numpy import exp
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# Constants from the old C code.
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const1 = 26.660820
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const2 = 0.0091379024
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const3 = 6106.396
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const4 = 0.622
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const5 = 2740.0
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##
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# The method that does the actual calculation.
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# Adapted from the old adiabatic_te.c function.
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# This method skips conversion of temp and pressure to NaN arrays
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# and back again. It can be called directly if temp and pressure are
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# guaranteed to be valid, or if they are already NaN arrays.
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#
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# @param temp: Temperature (K)
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# @param pressure: Pressure (mb)
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# @return: Adiabatic temperature (K)
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# @rtype: numpy masked array
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def calculate(temp, pressure):
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ee = exp(const1 - const2*temp - const3/temp)
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pme = pressure-ee
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ee *= const4
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ee = ee / pme
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result = temp * exp(const5*ee/temp)
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return result
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##
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# Calculate adaibatic temperature.
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#
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# @param temp: Temperature (K)
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# @param pressure: Pressure (mb)
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# @return: Adiabatic temperature
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def execute(temp, pressure):
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result = calculate(temp, pressure)
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return result
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